Piwik\Plugins\Installation\ServerFilesGenerator::createWebRootFiles PHP Method

    public static function createWebRootFiles()
    {
        $filesToCreate = array('/robots.txt', '/favicon.ico');
        foreach ($filesToCreate as $file) {
            $path = PIWIK_DOCUMENT_ROOT . $file;
            if (!file_exists($path)) {
                @file_put_contents($path, '');
            }
        }
    }

 protected static function initServerFilesForSecurity()
 {
     if (SettingsServer::isIIS()) {
         ServerFilesGenerator::createWebConfigFiles();
     } else {
         ServerFilesGenerator::createHtAccessFiles();
     }
     ServerFilesGenerator::createWebRootFiles();
 }